Abstract
Superconducting YBa2Cu3Oy ultra-thin filmswith thicknesses of 2-25 nm were deposited on (100) SrTiO3substrates. The thickness dependence of superconductivity for YBa2Cu3Oy thin films was investigated. It was found thatTc showed only a small decrease for films with thickness greater than15 nm, but dropped significantly when less than 10 nm. The variation ofTc with the film thickness fits an empirical relation of Tc0 = Tcbulk(1-dm/d). Based on this relation, a critical thickness dm = 1.56 nm was deduced, suggesting that superconductivity can be expected forone-unit-cell thick YBa2Cu3Oy films.
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